Thrust reverser with sliding pivot joints

Abstract

A target type thrust reverser is provided for reversing the thrust of jet engines, particularly on aircraft. The thrust reverser preferably has a plurality of doors that occupy a stowed position about the nozzle of the jet engine until deployed. In the stowed position, the doors are out of the exhaust stream of the jet engine. The doors are mounted to pivot joints on the rear portions of the doors. To deploy the thrust reverser, actuators connected to the pivot joints cause the pivot joints to translate linearly aft, and link rods attached to the forward portions of the doors cause the doors to pivot about the sliding pivot joints. In this manner, the distance between the doors and the engine exhaust nozzle is minimized during deployment, which enables significant weight savings due to reduced loads and fewer parts. A novel lock is also provided for simultaneously locking the thrust reverser doors and the actuators.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. patent application No. 09 / 909,561, filed Jul. 20, 2001 now U.S. Pat. No. 6,845,945, the full disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates generally to thrust reversers for jet engines, and more particularly to a target type thrust reverser in which the doors are mounted to sliding pivot joints.[0004]2. Description of the Related Art[0005]In the field of jet engines, and particularly in the field of jet aircraft engines, it frequently becomes advantageous to reverse the thrust of the engine in order to supply a braking force to the structure to which the engine is attached. On jet aircraft, thrust reversers are typically used to shorten the distance that the aircraft travels on the runway after landing and to enhance safety when braking the aircraft on a damp or icy runway. Various types of thrust rever...

AI Technical Summary

Benefits of technology

"The present invention provides an improved target thrust reverser for jet engines that reverses substantially the entire exhaust stream, including both core exhaust and bypass fan exhaust. The doors are mounted to pivot joints near the aft portions of the doors, and link rods and actuators are provided near the forward portions of the doors. The actuators cause the pivot joints to translate linearly aft, and the forward link rods cause the doors to rotate about the pivot joints. The thrust reverser is designed to minimize the distance between the doors and the engine during deployment, which reduces loads on the thrust reverser and allows for smaller actuators with reduced weight. The thrust reverser is also simpler and more reliable, and reduces cost and weight due to fewer parts and reduced mass of the remaining parts."

Problems solved by technology

Because fan only reversers are capable of reversing only the fan air and not the core engine exhaust, fan only reversers are not capable of providing as much reverse thrust as a full jet thrust reverser.

Although a four-bar link system such as that disclosed in Mutch reverses substantially all of the engine exhaust and therefore provides considerably more reverse thrust than a fan only thrust reverser, a four-bar link system has the drawback of increased weight because the structure must be quite heavy in order to carry the increased forces and moments that the system generates.

Additionally, the four bars constitute extra moving parts that add an extra level of complication and cost.

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